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1; RUN: opt -O2 %s | llvm-dis > %t12; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s3; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s4; Source code:5; union v1 { int a; int b; };6; typedef union v1 __v1;7; union v2 { int c; int d; };8; typedef union v2 __v2;9; union v3 { char c; volatile const __v2 d; };10; typedef union v3 __v3;11; #define _(x) (__builtin_preserve_access_index(x))12; #define cast_to_v1(x) ((__v1 *)(x))13; int get_value(const int *arg);14; int test(__v3 *arg) {15; return get_value(_(&cast_to_v1(&arg->d)->b));16; }17; Compilation flag:18; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c19 20target triple = "bpf"21 22%union.v3 = type { %union.v2 }23%union.v2 = type { i32 }24%union.v1 = type { i32 }25 26; Function Attrs: nounwind27define dso_local i32 @test(ptr %arg) local_unnamed_addr !dbg !15 {28entry:29 call void @llvm.dbg.value(metadata ptr %arg, metadata !33, metadata !DIExpression()), !dbg !3430 %0 = tail call ptr @llvm.preserve.union.access.index.p0.p0(ptr %arg, i32 1), !dbg !35, !llvm.preserve.access.index !2031 %1 = bitcast ptr %0 to ptr, !dbg !3532 %2 = tail call ptr @llvm.preserve.union.access.index.p0.p0(ptr %1, i32 1), !dbg !35, !llvm.preserve.access.index !633 %b = getelementptr inbounds %union.v1, ptr %2, i64 0, i32 0, !dbg !3534 %call = tail call i32 @get_value(ptr %b), !dbg !3635 ret i32 %call, !dbg !3736}37 38; CHECK: r2 = 039; CHECK: r1 += r240; CHECK: r2 = 041; CHECK: r1 += r242; CHECK: call get_value43 44; CHECK: .long 6 # BTF_KIND_UNION(id = [[TID1:[0-9]+]])45; CHECK: .long 91 # BTF_KIND_UNION(id = [[TID2:[0-9]+]])46 47; CHECK: .ascii "v3" # string offset=648; CHECK: .ascii ".text" # string offset=3949; CHECK: .ascii "0:1" # string offset=4550; CHECK: .ascii "v1" # string offset=9151 52; CHECK: .long 16 # FieldReloc53; CHECK-NEXT: .long 39 # Field reloc section string offset=3954; CHECK-NEXT: .long 255; CHECK-NEXT: .long .Ltmp{{[0-9]+}}56; CHECK-NEXT: .long [[TID1]]57; CHECK-NEXT: .long 4558; CHECK-NEXT: .long 059; CHECK-NEXT: .long .Ltmp{{[0-9]+}}60; CHECK-NEXT: .long [[TID2]]61; CHECK-NEXT: .long 4562; CHECK-NEXT: .long 063 64declare dso_local i32 @get_value(ptr) local_unnamed_addr65 66; Function Attrs: nounwind readnone67declare ptr @llvm.preserve.union.access.index.p0.p0(ptr, i32)68 69; Function Attrs: nounwind readnone70 71; Function Attrs: nounwind readnone speculatable willreturn72declare void @llvm.dbg.value(metadata, metadata, metadata)73 74!llvm.dbg.cu = !{!0}75!llvm.module.flags = !{!11, !12, !13}76!llvm.ident = !{!14}77 78!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)79!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast")80!2 = !{}81!3 = !{!4}82!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)83!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v1", file: !1, line: 2, baseType: !6)84!6 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v1", file: !1, line: 1, size: 32, elements: !7)85!7 = !{!8, !10}86!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !1, line: 1, baseType: !9, size: 32)87!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)88!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !1, line: 1, baseType: !9, size: 32)89!11 = !{i32 2, !"Dwarf Version", i32 4}90!12 = !{i32 2, !"Debug Info Version", i32 3}91!13 = !{i32 1, !"wchar_size", i32 4}92!14 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"}93!15 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 10, type: !16, scopeLine: 10, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !32)94!16 = !DISubroutineType(types: !17)95!17 = !{!9, !18}96!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)97!19 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !1, line: 6, baseType: !20)98!20 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v3", file: !1, line: 5, size: 32, elements: !21)99!21 = !{!22, !24}100!22 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !20, file: !1, line: 5, baseType: !23, size: 8)101!23 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)102!24 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !20, file: !1, line: 5, baseType: !25, size: 32)103!25 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !26)104!26 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !27)105!27 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v2", file: !1, line: 4, baseType: !28)106!28 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v2", file: !1, line: 3, size: 32, elements: !29)107!29 = !{!30, !31}108!30 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !28, file: !1, line: 3, baseType: !9, size: 32)109!31 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !28, file: !1, line: 3, baseType: !9, size: 32)110!32 = !{!33}111!33 = !DILocalVariable(name: "arg", arg: 1, scope: !15, file: !1, line: 10, type: !18)112!34 = !DILocation(line: 0, scope: !15)113!35 = !DILocation(line: 11, column: 20, scope: !15)114!36 = !DILocation(line: 11, column: 10, scope: !15)115!37 = !DILocation(line: 11, column: 3, scope: !15)116